Enter the bolt load / preload force (N or lbf), the diameter (mm or inch), and the nut factor (k-value) into the calculator to determine the Gasket Torque.
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Gasket Torque Formula
The following formula is used to calculate the Gasket Torque.
Tg =F*D*k / 1000
- Where Tg is the Gasket Torque (N-m)
- F is the bolt load / preload force (N)
- D is the diameter (mm)
- k is the nut factor (k-value)
To calculate the gasket torque, multiply the bolt load (force) by the diameter, then multiply by the nut factor, then finally divide by 1000 (to convert mm to m). This is the common torque–preload approximation T ≈ K·F·D, with D expressed in meters.
How to Calculate Gasket Torque?
The following example problems outline how to calculate the Gasket Torque.
Example Problem #1
- First, determine the bolt load / preload force (N). In this example, the bolt load (N) is given as 50,000.
- Next, determine the diameter (mm). For this problem, the diameter (mm) is given as 20.
- Next, determine the nut factor (k-value). In this case, the nut factor (k-value) is found to be 0.20.
- Finally, calculate the Gasket Torque using the formula above:
Tg =F*D*k / 1000
Inserting the values from above and solving yields:
Tg =50,000*20*0.20 / 1000 = 200 (N-m)
Example Problem #2
Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:
bolt load (N) = 60,000
diameter (mm) = 40
nut factor (k-value) = 0.18
Entering these given values yields:
Tg =60,000*40*0.18 / 1000 = 432 (N-m)
